- fix regression in duplicate ID layout test

        * khtml/xml/DocumentImpl.cpp:
        (DocumentImpl::getElementById): Change to take AtomicString, so we can use
        the string pointer as a hash key and not worry about ref'ing the pointer or
        about object lifetime since the string will be stored for the lifetime of the
        ID attribute. Also update for the counted set formerly named m_idCount to use
        its new name, m_duplicateIds.
        (DocumentImpl::addElementById): Ditto.
        (DocumentImpl::removeElementById): Ditto.
        (DocumentImpl::recalcStyleSelector): Pass a DOMStringImpl* (see below).
        * khtml/xml/DocumentImpl.h: Change functions to take AtomicString.

        * kcanvas/KCanvasFilters.cpp: (getFilterById): Use AtomicString.
        * kcanvas/KCanvasFilters.h: Ditto.
        * kcanvas/KCanvasResources.cpp:
        (getResourceById): Ditto.
        (getMarkerById): Ditto.
        (getClipperById): Ditto.
        (getMaskerById): Ditto.
        (getPaintServerById): Ditto.
        * kcanvas/KCanvasResources.h: Ditto.
        * khtml/ecma/kjs_window.cpp: (KJS::Window::getOwnPropertySlot): Ditto.
        * khtml/html/HTMLLabelElementImpl.cpp:
        (DOM::HTMLLabelElementImpl::formElement): Ditto.
        * khtml/xml/NodeListImpl.cpp: (DOM::NodeListImpl::itemById): Ditto.
        * khtml/xml/NodeListImpl.h: Ditto. Also removed unnecessary "virtual".

        * khtml/ecma/kjs_css.cpp:
        (KJS::DOMStyleSheetList::nameGetter): Pass a DOMStringImpl*, which gets
        converted to an AtomicString implicitly, rather than a DOMString, which
        does not. (But that's a crazy rule -- we should change this around long term.)
        (KJS::DOMStyleSheetList::getOwnPropertySlot): Ditto.
        * khtml/ecma/kjs_dom.cpp:
        (KJS::DOMNodeList::nameGetter): Ditto.
        (KJS::DOMNodeList::getOwnPropertySlot): Ditto.
        (KJS::DOMDocumentProtoFunc::callAsFunction): Ditto.

        - Merge khtml, DOM, and KDOM into one big namespace, WebCore.

        * WebCorePrefix.h: Use defined to map the old namespace names to WebCore.
        Now that this is done in the prefix, we can start actually calling it by
        that name, phase out the old names, then remove the defines.

        - other changes

        * khtml/xml/DocumentTypeImpl.cpp: Converted tabs to spaces.
        * khtml/xml/dom2_eventsimpl.cpp: Ditto.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@12116 268f45cc-cd09-0410-ab3c-d52691b4dbfc